REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday 4 February 2019

LG CM 4630 MINI HI-FI SYSTEM – SMPS CIRCUIT DIAGRAM – NO POWER TROUBLESHOOTING - FIRMWARE UPDATE

CM 4630 LG Mini Hi-Fi System – SMPS circuit diagram – No Power troubleshooting - firmware update

HIDDEN KEY MODE
Push both Front key and RCU key to activate it for 5 seconds. 1. Disc Lock On/Off (CD Function Only Active)
„ Front Key : STOP
„ RCU Key : STOP 2. Check Version and Option code
„ Front Key : STOP
„ RCU Key : PLAY/PAUSE
„ You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-. 3. Clear EEPROM
„ Front Key : STOP
„ RCU Key : SKIP- 4. Edit EEPROM
„ Front Key : STOP
„ RCU Key : SKIP+
„ You can change the digit of option by SKIP +/-.
„ You can edit 0~f by REPEAT or PLAY/PAUSE key.
5. Bluetooth DUT
„ Front Key : STOP
„ RCU Key : PROGRAM
„ Bluetooth model only 6. Power Disc Lock On/Off (CD Function Only Active)
„ Front Key : STOP
„ RCU Key : EQ 7. Amp Clip On/Off
„ Front Key : STOP
„ RCU Key : Mute
Amp Clip Mode Change (Amp Clip On  > Amp Clip Off  > Level Down display). 8. Demo ALL Key Lock (CM9520/CM8520 Only)
„ Front Key : STOP
„ RCU Key : 9
Demo All Key Lock Change (All Key Lock On  > All Key Lock Off).
- Working on Demo Operation only.
- When All Key Lock, Volume Key work only.
- After All Key Lock Off, it can unlock Demo Mode.
SMPS circuit diagram [Click on the circuit diagram to magnify]
NO-POWER troubleshooting
If the unit doesn’t work by no power problem, repair the set according to the following FUSE & BRIDGE DIODE
Check and replace F901, BD901, TH901 on SMPS board.
How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
3) Check if the NTC thermistor TH901 is normal or open.
If the unit doesn’t work by no power problem, repair the set according to the following
D929
Solution
Check and replace D929 on SMPS board.
How to troubleshoot (Countermeasure)
1) Check the Anode-Cathode Voltage of D929 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.  => If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.
PROGRAM DOWNLOAD and UPDATE
AUDIO PROGRAM
Download program file name must be CM4530_***.HEX
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
CD PROGRAM
Download program file name must be HF000_CM4530_xxxxxxxx_xx.bin
Tip) With B/T : HF000_CM4530_xxxxxxxx_xx.bin
Without B/T : HF400_CM4530_xxxxxxxx_xx.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
EQ PROGRAM
Download program file name must be EQ_PRG_CM4530_***.BIN
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
AMPLIFIER
Stereo mode 250 W + 250 W (3 Ω at 1 kHz, THD 10 %)
Surround mode (Front) 250 W + 250 W (3 Ω at 1 kHz, THD 10 %)
FRONT SPEAKER
Model CMS4630F
Type 2 Way 2 Speaker
Impedance 3 Ω
Rated Input Power 250 W
Max. Input power 500 W
Net Dimensions (W x H x D) 245 x 343 x 452 mm
Net Weight 5.55 kg
Posted By: FRANK at 06:37
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